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procfs directory entry cleanup
[net-next-2.6.git] / kernel / sysctl.c
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1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4
LT		 21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/proc_fs.h>
c59ede7b 27#include <linux/capability.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/capability.h>
31#include <linux/smp_lock.h>
32#include <linux/init.h>
33#include <linux/kernel.h>
0296b228 34#include <linux/kobject.h>
20380731 35#include <linux/net.h>
1da177e4
LT		 36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/hugetlb.h>
40#include <linux/security.h>
41#include <linux/initrd.h>
42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
c255d844
PM		 46#include <linux/nfs_fs.h>
47#include <linux/acpi.h>
1da177e4
LT		 48
49#include <asm/uaccess.h>
50#include <asm/processor.h>
51
529bf6be
DS		 52extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
53 void __user *buffer, size_t *lenp, loff_t *ppos);
54
29cbc78b
AK		 55#ifdef CONFIG_X86
56#include <asm/nmi.h>
0741f4d2 57#include <asm/stacktrace.h>
29cbc78b
AK		 58#endif
59
1da177e4
LT		 60#if defined(CONFIG_SYSCTL)
61
62/* External variables not in a header file. */
63extern int C_A_D;
64extern int sysctl_overcommit_memory;
65extern int sysctl_overcommit_ratio;
fadd8fbd 66extern int sysctl_panic_on_oom;
1da177e4 67extern int max_threads;
1da177e4 68extern int core_uses_pid;
d6e71144 69extern int suid_dumpable;
1da177e4 70extern char core_pattern[];
1da177e4
LT		 71extern int pid_max;
72extern int min_free_kbytes;
73extern int printk_ratelimit_jiffies;
74extern int printk_ratelimit_burst;
75extern int pid_max_min, pid_max_max;
9d0243bc 76extern int sysctl_drop_caches;
8ad4b1fb 77extern int percpu_pagelist_fraction;
bebfa101 78extern int compat_log;
5096add8 79extern int maps_protect;
77461ab3 80extern int sysctl_stat_interval;
1da177e4 81
1da177e4
LT		 82/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
83static int maxolduid = 65535;
84static int minolduid;
8ad4b1fb 85static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 86
87static int ngroups_max = NGROUPS_MAX;
88
89#ifdef CONFIG_KMOD
90extern char modprobe_path[];
91#endif
1da177e4
LT		 92#ifdef CONFIG_CHR_DEV_SG
93extern int sg_big_buff;
94#endif
1da177e4
LT		 95
96#ifdef __sparc__
97extern char reboot_command [];
98extern int stop_a_enabled;
99extern int scons_pwroff;
100#endif
101
102#ifdef __hppa__
103extern int pwrsw_enabled;
104extern int unaligned_enabled;
105#endif
106
347a8dc3 107#ifdef CONFIG_S390
1da177e4
LT		 108#ifdef CONFIG_MATHEMU
109extern int sysctl_ieee_emulation_warnings;
110#endif
111extern int sysctl_userprocess_debug;
951f22d5 112extern int spin_retry;
1da177e4
LT		 113#endif
114
115extern int sysctl_hz_timer;
116
117#ifdef CONFIG_BSD_PROCESS_ACCT
118extern int acct_parm[];
119#endif
120
d2b176ed
JS		 121#ifdef CONFIG_IA64
122extern int no_unaligned_warning;
123#endif
124
23f78d4a
IM		 125#ifdef CONFIG_RT_MUTEXES
126extern int max_lock_depth;
127#endif
128
b89a8171
EB		 129#ifdef CONFIG_SYSCTL_SYSCALL
130static int parse_table(int __user *, int, void __user *, size_t __user *,
1f29bcd7 131 void __user *, size_t, ctl_table *);
b89a8171
EB		 132#endif
133
6b49a257 134
d6f8ff73 135#ifdef CONFIG_PROC_SYSCTL
9ec52099
CLG		 136static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
137 void __user *buffer, size_t *lenp, loff_t *ppos);
34f5a398
TT		 138static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
139 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 140#endif
9ec52099 141
1da177e4
LT		 142static ctl_table root_table[];
143static struct ctl_table_header root_table_header =
144 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
145
146static ctl_table kern_table[];
147static ctl_table vm_table[];
1da177e4
LT		 148static ctl_table fs_table[];
149static ctl_table debug_table[];
150static ctl_table dev_table[];
151extern ctl_table random_table[];
152#ifdef CONFIG_UNIX98_PTYS
153extern ctl_table pty_table[];
154#endif
2d9048e2 155#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 156extern ctl_table inotify_table[];
157#endif
1da177e4
LT		 158
159#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
160int sysctl_legacy_va_layout;
161#endif
162
9bc9a6bd 163
1da177e4
LT		 164/* The default sysctl tables: */
165
166static ctl_table root_table[] = {
167 {
168 .ctl_name = CTL_KERN,
169 .procname = "kernel",
170 .mode = 0555,
171 .child = kern_table,
172 },
173 {
174 .ctl_name = CTL_VM,
175 .procname = "vm",
176 .mode = 0555,
177 .child = vm_table,
178 },
179#ifdef CONFIG_NET
180 {
181 .ctl_name = CTL_NET,
182 .procname = "net",
183 .mode = 0555,
184 .child = net_table,
185 },
186#endif
1da177e4
LT		 187 {
188 .ctl_name = CTL_FS,
189 .procname = "fs",
190 .mode = 0555,
191 .child = fs_table,
192 },
193 {
194 .ctl_name = CTL_DEBUG,
195 .procname = "debug",
196 .mode = 0555,
197 .child = debug_table,
198 },
199 {
200 .ctl_name = CTL_DEV,
201 .procname = "dev",
202 .mode = 0555,
203 .child = dev_table,
204 },
0eeca283 205
1da177e4
LT		 206 { .ctl_name = 0 }
207};
208
77e54a1f
IM		 209#ifdef CONFIG_SCHED_DEBUG
210static unsigned long min_sched_granularity_ns = 100000; /* 100 usecs */
211static unsigned long max_sched_granularity_ns = 1000000000; /* 1 second */
212static unsigned long min_wakeup_granularity_ns; /* 0 usecs */
213static unsigned long max_wakeup_granularity_ns = 1000000000; /* 1 second */
214#endif
215
1da177e4 216static ctl_table kern_table[] = {
77e54a1f
IM		 217#ifdef CONFIG_SCHED_DEBUG
218 {
219 .ctl_name = CTL_UNNUMBERED,
220 .procname = "sched_granularity_ns",
221 .data = &sysctl_sched_granularity,
222 .maxlen = sizeof(unsigned int),
223 .mode = 0644,
224 .proc_handler = &proc_dointvec_minmax,
225 .strategy = &sysctl_intvec,
226 .extra1 = &min_sched_granularity_ns,
227 .extra2 = &max_sched_granularity_ns,
228 },
229 {
230 .ctl_name = CTL_UNNUMBERED,
231 .procname = "sched_wakeup_granularity_ns",
232 .data = &sysctl_sched_wakeup_granularity,
233 .maxlen = sizeof(unsigned int),
234 .mode = 0644,
235 .proc_handler = &proc_dointvec_minmax,
236 .strategy = &sysctl_intvec,
237 .extra1 = &min_wakeup_granularity_ns,
238 .extra2 = &max_wakeup_granularity_ns,
239 },
240 {
241 .ctl_name = CTL_UNNUMBERED,
242 .procname = "sched_batch_wakeup_granularity_ns",
243 .data = &sysctl_sched_batch_wakeup_granularity,
244 .maxlen = sizeof(unsigned int),
245 .mode = 0644,
246 .proc_handler = &proc_dointvec_minmax,
247 .strategy = &sysctl_intvec,
248 .extra1 = &min_wakeup_granularity_ns,
249 .extra2 = &max_wakeup_granularity_ns,
250 },
251 {
252 .ctl_name = CTL_UNNUMBERED,
253 .procname = "sched_stat_granularity_ns",
254 .data = &sysctl_sched_stat_granularity,
255 .maxlen = sizeof(unsigned int),
256 .mode = 0644,
257 .proc_handler = &proc_dointvec_minmax,
258 .strategy = &sysctl_intvec,
259 .extra1 = &min_wakeup_granularity_ns,
260 .extra2 = &max_wakeup_granularity_ns,
261 },
262 {
263 .ctl_name = CTL_UNNUMBERED,
264 .procname = "sched_runtime_limit_ns",
265 .data = &sysctl_sched_runtime_limit,
266 .maxlen = sizeof(unsigned int),
267 .mode = 0644,
268 .proc_handler = &proc_dointvec_minmax,
269 .strategy = &sysctl_intvec,
270 .extra1 = &min_sched_granularity_ns,
271 .extra2 = &max_sched_granularity_ns,
272 },
273 {
274 .ctl_name = CTL_UNNUMBERED,
275 .procname = "sched_child_runs_first",
276 .data = &sysctl_sched_child_runs_first,
277 .maxlen = sizeof(unsigned int),
278 .mode = 0644,
279 .proc_handler = &proc_dointvec,
280 },
281 {
282 .ctl_name = CTL_UNNUMBERED,
283 .procname = "sched_features",
284 .data = &sysctl_sched_features,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = &proc_dointvec,
288 },
289#endif
1da177e4
LT		 290 {
291 .ctl_name = KERN_PANIC,
292 .procname = "panic",
293 .data = &panic_timeout,
294 .maxlen = sizeof(int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec,
297 },
298 {
299 .ctl_name = KERN_CORE_USES_PID,
300 .procname = "core_uses_pid",
301 .data = &core_uses_pid,
302 .maxlen = sizeof(int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
306 {
307 .ctl_name = KERN_CORE_PATTERN,
308 .procname = "core_pattern",
309 .data = core_pattern,
71ce92f3 310 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 311 .mode = 0644,
312 .proc_handler = &proc_dostring,
313 .strategy = &sysctl_string,
314 },
34f5a398 315#ifdef CONFIG_PROC_SYSCTL
1da177e4
LT		 316 {
317 .ctl_name = KERN_TAINTED,
318 .procname = "tainted",
319 .data = &tainted,
320 .maxlen = sizeof(int),
34f5a398
TT		 321 .mode = 0644,
322 .proc_handler = &proc_dointvec_taint,
1da177e4 323 },
34f5a398 324#endif
1da177e4
LT		 325 {
326 .ctl_name = KERN_CAP_BSET,
327 .procname = "cap-bound",
328 .data = &cap_bset,
329 .maxlen = sizeof(kernel_cap_t),
330 .mode = 0600,
331 .proc_handler = &proc_dointvec_bset,
332 },
333#ifdef CONFIG_BLK_DEV_INITRD
334 {
335 .ctl_name = KERN_REALROOTDEV,
336 .procname = "real-root-dev",
337 .data = &real_root_dev,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = &proc_dointvec,
341 },
342#endif
343#ifdef __sparc__
344 {
345 .ctl_name = KERN_SPARC_REBOOT,
346 .procname = "reboot-cmd",
347 .data = reboot_command,
348 .maxlen = 256,
349 .mode = 0644,
350 .proc_handler = &proc_dostring,
351 .strategy = &sysctl_string,
352 },
353 {
354 .ctl_name = KERN_SPARC_STOP_A,
355 .procname = "stop-a",
356 .data = &stop_a_enabled,
357 .maxlen = sizeof (int),
358 .mode = 0644,
359 .proc_handler = &proc_dointvec,
360 },
361 {
362 .ctl_name = KERN_SPARC_SCONS_PWROFF,
363 .procname = "scons-poweroff",
364 .data = &scons_pwroff,
365 .maxlen = sizeof (int),
366 .mode = 0644,
367 .proc_handler = &proc_dointvec,
368 },
369#endif
370#ifdef __hppa__
371 {
372 .ctl_name = KERN_HPPA_PWRSW,
373 .procname = "soft-power",
374 .data = &pwrsw_enabled,
375 .maxlen = sizeof (int),
376 .mode = 0644,
377 .proc_handler = &proc_dointvec,
378 },
379 {
380 .ctl_name = KERN_HPPA_UNALIGNED,
381 .procname = "unaligned-trap",
382 .data = &unaligned_enabled,
383 .maxlen = sizeof (int),
384 .mode = 0644,
385 .proc_handler = &proc_dointvec,
386 },
387#endif
388 {
389 .ctl_name = KERN_CTLALTDEL,
390 .procname = "ctrl-alt-del",
391 .data = &C_A_D,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
396 {
397 .ctl_name = KERN_PRINTK,
398 .procname = "printk",
399 .data = &console_loglevel,
400 .maxlen = 4*sizeof(int),
401 .mode = 0644,
402 .proc_handler = &proc_dointvec,
403 },
404#ifdef CONFIG_KMOD
405 {
406 .ctl_name = KERN_MODPROBE,
407 .procname = "modprobe",
408 .data = &modprobe_path,
409 .maxlen = KMOD_PATH_LEN,
410 .mode = 0644,
411 .proc_handler = &proc_dostring,
412 .strategy = &sysctl_string,
413 },
414#endif
57ae2508 415#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 416 {
417 .ctl_name = KERN_HOTPLUG,
418 .procname = "hotplug",
312c004d
KS		 419 .data = &uevent_helper,
420 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 421 .mode = 0644,
422 .proc_handler = &proc_dostring,
423 .strategy = &sysctl_string,
424 },
425#endif
426#ifdef CONFIG_CHR_DEV_SG
427 {
428 .ctl_name = KERN_SG_BIG_BUFF,
429 .procname = "sg-big-buff",
430 .data = &sg_big_buff,
431 .maxlen = sizeof (int),
432 .mode = 0444,
433 .proc_handler = &proc_dointvec,
434 },
435#endif
436#ifdef CONFIG_BSD_PROCESS_ACCT
437 {
438 .ctl_name = KERN_ACCT,
439 .procname = "acct",
440 .data = &acct_parm,
441 .maxlen = 3*sizeof(int),
442 .mode = 0644,
443 .proc_handler = &proc_dointvec,
444 },
445#endif
1da177e4
LT		 446#ifdef CONFIG_MAGIC_SYSRQ
447 {
448 .ctl_name = KERN_SYSRQ,
449 .procname = "sysrq",
5d6f647f 450 .data = &__sysrq_enabled,
1da177e4
LT		 451 .maxlen = sizeof (int),
452 .mode = 0644,
453 .proc_handler = &proc_dointvec,
454 },
455#endif
d6f8ff73 456#ifdef CONFIG_PROC_SYSCTL
1da177e4
LT		 457 {
458 .ctl_name = KERN_CADPID,
459 .procname = "cad_pid",
9ec52099 460 .data = NULL,
1da177e4
LT		 461 .maxlen = sizeof (int),
462 .mode = 0600,
9ec52099 463 .proc_handler = &proc_do_cad_pid,
1da177e4 464 },
d6f8ff73 465#endif
1da177e4
LT		 466 {
467 .ctl_name = KERN_MAX_THREADS,
468 .procname = "threads-max",
469 .data = &max_threads,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = &proc_dointvec,
473 },
474 {
475 .ctl_name = KERN_RANDOM,
476 .procname = "random",
477 .mode = 0555,
478 .child = random_table,
479 },
480#ifdef CONFIG_UNIX98_PTYS
481 {
482 .ctl_name = KERN_PTY,
483 .procname = "pty",
484 .mode = 0555,
485 .child = pty_table,
486 },
487#endif
488 {
489 .ctl_name = KERN_OVERFLOWUID,
490 .procname = "overflowuid",
491 .data = &overflowuid,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec_minmax,
495 .strategy = &sysctl_intvec,
496 .extra1 = &minolduid,
497 .extra2 = &maxolduid,
498 },
499 {
500 .ctl_name = KERN_OVERFLOWGID,
501 .procname = "overflowgid",
502 .data = &overflowgid,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = &proc_dointvec_minmax,
506 .strategy = &sysctl_intvec,
507 .extra1 = &minolduid,
508 .extra2 = &maxolduid,
509 },
347a8dc3 510#ifdef CONFIG_S390
1da177e4
LT		 511#ifdef CONFIG_MATHEMU
512 {
513 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
514 .procname = "ieee_emulation_warnings",
515 .data = &sysctl_ieee_emulation_warnings,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = &proc_dointvec,
519 },
520#endif
521#ifdef CONFIG_NO_IDLE_HZ
522 {
523 .ctl_name = KERN_HZ_TIMER,
524 .procname = "hz_timer",
525 .data = &sysctl_hz_timer,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = &proc_dointvec,
529 },
530#endif
531 {
532 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
533 .procname = "userprocess_debug",
534 .data = &sysctl_userprocess_debug,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = &proc_dointvec,
538 },
539#endif
540 {
541 .ctl_name = KERN_PIDMAX,
542 .procname = "pid_max",
543 .data = &pid_max,
544 .maxlen = sizeof (int),
545 .mode = 0644,
546 .proc_handler = &proc_dointvec_minmax,
547 .strategy = sysctl_intvec,
548 .extra1 = &pid_max_min,
549 .extra2 = &pid_max_max,
550 },
551 {
552 .ctl_name = KERN_PANIC_ON_OOPS,
553 .procname = "panic_on_oops",
554 .data = &panic_on_oops,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = &proc_dointvec,
558 },
559 {
560 .ctl_name = KERN_PRINTK_RATELIMIT,
561 .procname = "printk_ratelimit",
562 .data = &printk_ratelimit_jiffies,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = &proc_dointvec_jiffies,
566 .strategy = &sysctl_jiffies,
567 },
568 {
569 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
570 .procname = "printk_ratelimit_burst",
571 .data = &printk_ratelimit_burst,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = &proc_dointvec,
575 },
576 {
577 .ctl_name = KERN_NGROUPS_MAX,
578 .procname = "ngroups_max",
579 .data = &ngroups_max,
580 .maxlen = sizeof (int),
581 .mode = 0444,
582 .proc_handler = &proc_dointvec,
583 },
584#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
585 {
586 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
587 .procname = "unknown_nmi_panic",
588 .data = &unknown_nmi_panic,
589 .maxlen = sizeof (int),
590 .mode = 0644,
2fbe7b25 591 .proc_handler = &proc_dointvec,
1da177e4 592 },
407984f1
DZ		 593 {
594 .ctl_name = KERN_NMI_WATCHDOG,
595 .procname = "nmi_watchdog",
596 .data = &nmi_watchdog_enabled,
597 .maxlen = sizeof (int),
598 .mode = 0644,
599 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 600 },
601#endif
602#if defined(CONFIG_X86)
8da5adda
DZ		 603 {
604 .ctl_name = KERN_PANIC_ON_NMI,
605 .procname = "panic_on_unrecovered_nmi",
606 .data = &panic_on_unrecovered_nmi,
607 .maxlen = sizeof(int),
608 .mode = 0644,
609 .proc_handler = &proc_dointvec,
610 },
1da177e4
LT		 611 {
612 .ctl_name = KERN_BOOTLOADER_TYPE,
613 .procname = "bootloader_type",
614 .data = &bootloader_type,
615 .maxlen = sizeof (int),
616 .mode = 0444,
617 .proc_handler = &proc_dointvec,
618 },
0741f4d2
CE		 619 {
620 .ctl_name = CTL_UNNUMBERED,
621 .procname = "kstack_depth_to_print",
622 .data = &kstack_depth_to_print,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = &proc_dointvec,
626 },
1da177e4 627#endif
7a9166e3 628#if defined(CONFIG_MMU)
1da177e4
LT		 629 {
630 .ctl_name = KERN_RANDOMIZE,
631 .procname = "randomize_va_space",
632 .data = &randomize_va_space,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = &proc_dointvec,
636 },
7a9166e3 637#endif
0152fb37 638#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 639 {
640 .ctl_name = KERN_SPIN_RETRY,
641 .procname = "spin_retry",
642 .data = &spin_retry,
643 .maxlen = sizeof (int),
644 .mode = 0644,
645 .proc_handler = &proc_dointvec,
646 },
c255d844
PM		 647#endif
648#ifdef CONFIG_ACPI_SLEEP
649 {
650 .ctl_name = KERN_ACPI_VIDEO_FLAGS,
651 .procname = "acpi_video_flags",
652 .data = &acpi_video_flags,
653 .maxlen = sizeof (unsigned long),
654 .mode = 0644,
7f99f06f 655 .proc_handler = &proc_doulongvec_minmax,
c255d844 656 },
d2b176ed
JS		 657#endif
658#ifdef CONFIG_IA64
659 {
660 .ctl_name = KERN_IA64_UNALIGNED,
661 .procname = "ignore-unaligned-usertrap",
662 .data = &no_unaligned_warning,
663 .maxlen = sizeof (int),
664 .mode = 0644,
665 .proc_handler = &proc_dointvec,
666 },
bebfa101
AK		 667#endif
668#ifdef CONFIG_COMPAT
669 {
670 .ctl_name = KERN_COMPAT_LOG,
671 .procname = "compat-log",
672 .data = &compat_log,
673 .maxlen = sizeof (int),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec,
676 },
951f22d5 677#endif
23f78d4a
IM		 678#ifdef CONFIG_RT_MUTEXES
679 {
680 .ctl_name = KERN_MAX_LOCK_DEPTH,
681 .procname = "max_lock_depth",
682 .data = &max_lock_depth,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = &proc_dointvec,
686 },
687#endif
5096add8
KC		 688#ifdef CONFIG_PROC_FS
689 {
690 .ctl_name = CTL_UNNUMBERED,
691 .procname = "maps_protect",
692 .data = &maps_protect,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = &proc_dointvec,
696 },
697#endif
23f78d4a 698
1da177e4
LT		 699 { .ctl_name = 0 }
700};
701
702/* Constants for minimum and maximum testing in vm_table.
703 We use these as one-element integer vectors. */
704static int zero;
705static int one_hundred = 100;
706
707
708static ctl_table vm_table[] = {
709 {
710 .ctl_name = VM_OVERCOMMIT_MEMORY,
711 .procname = "overcommit_memory",
712 .data = &sysctl_overcommit_memory,
713 .maxlen = sizeof(sysctl_overcommit_memory),
714 .mode = 0644,
715 .proc_handler = &proc_dointvec,
716 },
fadd8fbd
KH		 717 {
718 .ctl_name = VM_PANIC_ON_OOM,
719 .procname = "panic_on_oom",
720 .data = &sysctl_panic_on_oom,
721 .maxlen = sizeof(sysctl_panic_on_oom),
722 .mode = 0644,
723 .proc_handler = &proc_dointvec,
724 },
1da177e4
LT		 725 {
726 .ctl_name = VM_OVERCOMMIT_RATIO,
727 .procname = "overcommit_ratio",
728 .data = &sysctl_overcommit_ratio,
729 .maxlen = sizeof(sysctl_overcommit_ratio),
730 .mode = 0644,
731 .proc_handler = &proc_dointvec,
732 },
733 {
734 .ctl_name = VM_PAGE_CLUSTER,
735 .procname = "page-cluster",
736 .data = &page_cluster,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = &proc_dointvec,
740 },
741 {
742 .ctl_name = VM_DIRTY_BACKGROUND,
743 .procname = "dirty_background_ratio",
744 .data = &dirty_background_ratio,
745 .maxlen = sizeof(dirty_background_ratio),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec_minmax,
748 .strategy = &sysctl_intvec,
749 .extra1 = &zero,
750 .extra2 = &one_hundred,
751 },
752 {
753 .ctl_name = VM_DIRTY_RATIO,
754 .procname = "dirty_ratio",
755 .data = &vm_dirty_ratio,
756 .maxlen = sizeof(vm_dirty_ratio),
757 .mode = 0644,
758 .proc_handler = &proc_dointvec_minmax,
759 .strategy = &sysctl_intvec,
760 .extra1 = &zero,
761 .extra2 = &one_hundred,
762 },
763 {
764 .ctl_name = VM_DIRTY_WB_CS,
765 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 766 .data = &dirty_writeback_interval,
767 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 768 .mode = 0644,
769 .proc_handler = &dirty_writeback_centisecs_handler,
770 },
771 {
772 .ctl_name = VM_DIRTY_EXPIRE_CS,
773 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 774 .data = &dirty_expire_interval,
775 .maxlen = sizeof(dirty_expire_interval),
1da177e4 776 .mode = 0644,
f6ef9438 777 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 778 },
779 {
780 .ctl_name = VM_NR_PDFLUSH_THREADS,
781 .procname = "nr_pdflush_threads",
782 .data = &nr_pdflush_threads,
783 .maxlen = sizeof nr_pdflush_threads,
784 .mode = 0444 /* read-only*/,
785 .proc_handler = &proc_dointvec,
786 },
787 {
788 .ctl_name = VM_SWAPPINESS,
789 .procname = "swappiness",
790 .data = &vm_swappiness,
791 .maxlen = sizeof(vm_swappiness),
792 .mode = 0644,
793 .proc_handler = &proc_dointvec_minmax,
794 .strategy = &sysctl_intvec,
795 .extra1 = &zero,
796 .extra2 = &one_hundred,
797 },
798#ifdef CONFIG_HUGETLB_PAGE
799 {
800 .ctl_name = VM_HUGETLB_PAGES,
801 .procname = "nr_hugepages",
802 .data = &max_huge_pages,
803 .maxlen = sizeof(unsigned long),
804 .mode = 0644,
805 .proc_handler = &hugetlb_sysctl_handler,
806 .extra1 = (void *)&hugetlb_zero,
807 .extra2 = (void *)&hugetlb_infinity,
808 },
809 {
810 .ctl_name = VM_HUGETLB_GROUP,
811 .procname = "hugetlb_shm_group",
812 .data = &sysctl_hugetlb_shm_group,
813 .maxlen = sizeof(gid_t),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec,
816 },
817#endif
818 {
819 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
820 .procname = "lowmem_reserve_ratio",
821 .data = &sysctl_lowmem_reserve_ratio,
822 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
823 .mode = 0644,
824 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
825 .strategy = &sysctl_intvec,
826 },
9d0243bc
AM		 827 {
828 .ctl_name = VM_DROP_PAGECACHE,
829 .procname = "drop_caches",
830 .data = &sysctl_drop_caches,
831 .maxlen = sizeof(int),
832 .mode = 0644,
833 .proc_handler = drop_caches_sysctl_handler,
834 .strategy = &sysctl_intvec,
835 },
1da177e4
LT		 836 {
837 .ctl_name = VM_MIN_FREE_KBYTES,
838 .procname = "min_free_kbytes",
839 .data = &min_free_kbytes,
840 .maxlen = sizeof(min_free_kbytes),
841 .mode = 0644,
842 .proc_handler = &min_free_kbytes_sysctl_handler,
843 .strategy = &sysctl_intvec,
844 .extra1 = &zero,
845 },
8ad4b1fb
RS		 846 {
847 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
848 .procname = "percpu_pagelist_fraction",
849 .data = &percpu_pagelist_fraction,
850 .maxlen = sizeof(percpu_pagelist_fraction),
851 .mode = 0644,
852 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
853 .strategy = &sysctl_intvec,
854 .extra1 = &min_percpu_pagelist_fract,
855 },
1da177e4
LT		 856#ifdef CONFIG_MMU
857 {
858 .ctl_name = VM_MAX_MAP_COUNT,
859 .procname = "max_map_count",
860 .data = &sysctl_max_map_count,
861 .maxlen = sizeof(sysctl_max_map_count),
862 .mode = 0644,
863 .proc_handler = &proc_dointvec
864 },
865#endif
866 {
867 .ctl_name = VM_LAPTOP_MODE,
868 .procname = "laptop_mode",
869 .data = &laptop_mode,
870 .maxlen = sizeof(laptop_mode),
871 .mode = 0644,
ed5b43f1
BS		 872 .proc_handler = &proc_dointvec_jiffies,
873 .strategy = &sysctl_jiffies,
1da177e4
LT		 874 },
875 {
876 .ctl_name = VM_BLOCK_DUMP,
877 .procname = "block_dump",
878 .data = &block_dump,
879 .maxlen = sizeof(block_dump),
880 .mode = 0644,
881 .proc_handler = &proc_dointvec,
882 .strategy = &sysctl_intvec,
883 .extra1 = &zero,
884 },
885 {
886 .ctl_name = VM_VFS_CACHE_PRESSURE,
887 .procname = "vfs_cache_pressure",
888 .data = &sysctl_vfs_cache_pressure,
889 .maxlen = sizeof(sysctl_vfs_cache_pressure),
890 .mode = 0644,
891 .proc_handler = &proc_dointvec,
892 .strategy = &sysctl_intvec,
893 .extra1 = &zero,
894 },
895#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
896 {
897 .ctl_name = VM_LEGACY_VA_LAYOUT,
898 .procname = "legacy_va_layout",
899 .data = &sysctl_legacy_va_layout,
900 .maxlen = sizeof(sysctl_legacy_va_layout),
901 .mode = 0644,
902 .proc_handler = &proc_dointvec,
903 .strategy = &sysctl_intvec,
904 .extra1 = &zero,
905 },
906#endif
1743660b
CL		 907#ifdef CONFIG_NUMA
908 {
909 .ctl_name = VM_ZONE_RECLAIM_MODE,
910 .procname = "zone_reclaim_mode",
911 .data = &zone_reclaim_mode,
912 .maxlen = sizeof(zone_reclaim_mode),
913 .mode = 0644,
914 .proc_handler = &proc_dointvec,
c84db23c
CL		 915 .strategy = &sysctl_intvec,
916 .extra1 = &zero,
1743660b 917 },
9614634f
CL		 918 {
919 .ctl_name = VM_MIN_UNMAPPED,
920 .procname = "min_unmapped_ratio",
921 .data = &sysctl_min_unmapped_ratio,
922 .maxlen = sizeof(sysctl_min_unmapped_ratio),
923 .mode = 0644,
924 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
925 .strategy = &sysctl_intvec,
926 .extra1 = &zero,
927 .extra2 = &one_hundred,
928 },
0ff38490
CL		 929 {
930 .ctl_name = VM_MIN_SLAB,
931 .procname = "min_slab_ratio",
932 .data = &sysctl_min_slab_ratio,
933 .maxlen = sizeof(sysctl_min_slab_ratio),
934 .mode = 0644,
935 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
936 .strategy = &sysctl_intvec,
937 .extra1 = &zero,
938 .extra2 = &one_hundred,
939 },
e6e5494c 940#endif
77461ab3
CL		 941#ifdef CONFIG_SMP
942 {
943 .ctl_name = CTL_UNNUMBERED,
944 .procname = "stat_interval",
945 .data = &sysctl_stat_interval,
946 .maxlen = sizeof(sysctl_stat_interval),
947 .mode = 0644,
948 .proc_handler = &proc_dointvec_jiffies,
949 .strategy = &sysctl_jiffies,
950 },
951#endif
ed032189
EP		 952#ifdef CONFIG_SECURITY
953 {
954 .ctl_name = CTL_UNNUMBERED,
955 .procname = "mmap_min_addr",
956 .data = &mmap_min_addr,
957 .maxlen = sizeof(unsigned long),
958 .mode = 0644,
959 .proc_handler = &proc_doulongvec_minmax,
960 },
f0c0b2b8
KH		 961#ifdef CONFIG_NUMA
962 {
963 .ctl_name = CTL_UNNUMBERED,
964 .procname = "numa_zonelist_order",
965 .data = &numa_zonelist_order,
966 .maxlen = NUMA_ZONELIST_ORDER_LEN,
967 .mode = 0644,
968 .proc_handler = &numa_zonelist_order_handler,
969 .strategy = &sysctl_string,
970 },
971#endif
ed032189 972#endif
5c36e657
PM		 973#if defined(CONFIG_X86_32) || \
974 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 975 {
976 .ctl_name = VM_VDSO_ENABLED,
977 .procname = "vdso_enabled",
978 .data = &vdso_enabled,
979 .maxlen = sizeof(vdso_enabled),
980 .mode = 0644,
981 .proc_handler = &proc_dointvec,
982 .strategy = &sysctl_intvec,
983 .extra1 = &zero,
984 },
1da177e4
LT		 985#endif
986 { .ctl_name = 0 }
987};
988
2abc26fc
EB		 989#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
990static ctl_table binfmt_misc_table[] = {
991 { .ctl_name = 0 }
992};
993#endif
994
1da177e4
LT		 995static ctl_table fs_table[] = {
996 {
997 .ctl_name = FS_NRINODE,
998 .procname = "inode-nr",
999 .data = &inodes_stat,
1000 .maxlen = 2*sizeof(int),
1001 .mode = 0444,
1002 .proc_handler = &proc_dointvec,
1003 },
1004 {
1005 .ctl_name = FS_STATINODE,
1006 .procname = "inode-state",
1007 .data = &inodes_stat,
1008 .maxlen = 7*sizeof(int),
1009 .mode = 0444,
1010 .proc_handler = &proc_dointvec,
1011 },
1012 {
1013 .ctl_name = FS_NRFILE,
1014 .procname = "file-nr",
1015 .data = &files_stat,
1016 .maxlen = 3*sizeof(int),
1017 .mode = 0444,
529bf6be 1018 .proc_handler = &proc_nr_files,
1da177e4
LT		 1019 },
1020 {
1021 .ctl_name = FS_MAXFILE,
1022 .procname = "file-max",
1023 .data = &files_stat.max_files,
1024 .maxlen = sizeof(int),
1025 .mode = 0644,
1026 .proc_handler = &proc_dointvec,
1027 },
1028 {
1029 .ctl_name = FS_DENTRY,
1030 .procname = "dentry-state",
1031 .data = &dentry_stat,
1032 .maxlen = 6*sizeof(int),
1033 .mode = 0444,
1034 .proc_handler = &proc_dointvec,
1035 },
1036 {
1037 .ctl_name = FS_OVERFLOWUID,
1038 .procname = "overflowuid",
1039 .data = &fs_overflowuid,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = &proc_dointvec_minmax,
1043 .strategy = &sysctl_intvec,
1044 .extra1 = &minolduid,
1045 .extra2 = &maxolduid,
1046 },
1047 {
1048 .ctl_name = FS_OVERFLOWGID,
1049 .procname = "overflowgid",
1050 .data = &fs_overflowgid,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = &proc_dointvec_minmax,
1054 .strategy = &sysctl_intvec,
1055 .extra1 = &minolduid,
1056 .extra2 = &maxolduid,
1057 },
1058 {
1059 .ctl_name = FS_LEASES,
1060 .procname = "leases-enable",
1061 .data = &leases_enable,
1062 .maxlen = sizeof(int),
1063 .mode = 0644,
1064 .proc_handler = &proc_dointvec,
1065 },
1066#ifdef CONFIG_DNOTIFY
1067 {
1068 .ctl_name = FS_DIR_NOTIFY,
1069 .procname = "dir-notify-enable",
1070 .data = &dir_notify_enable,
1071 .maxlen = sizeof(int),
1072 .mode = 0644,
1073 .proc_handler = &proc_dointvec,
1074 },
1075#endif
1076#ifdef CONFIG_MMU
1077 {
1078 .ctl_name = FS_LEASE_TIME,
1079 .procname = "lease-break-time",
1080 .data = &lease_break_time,
1081 .maxlen = sizeof(int),
1082 .mode = 0644,
1083 .proc_handler = &proc_dointvec,
1084 },
1085 {
1086 .ctl_name = FS_AIO_NR,
1087 .procname = "aio-nr",
1088 .data = &aio_nr,
1089 .maxlen = sizeof(aio_nr),
1090 .mode = 0444,
d55b5fda 1091 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1092 },
1093 {
1094 .ctl_name = FS_AIO_MAX_NR,
1095 .procname = "aio-max-nr",
1096 .data = &aio_max_nr,
1097 .maxlen = sizeof(aio_max_nr),
1098 .mode = 0644,
d55b5fda 1099 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1100 },
2d9048e2 1101#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1102 {
1103 .ctl_name = FS_INOTIFY,
1104 .procname = "inotify",
1105 .mode = 0555,
1106 .child = inotify_table,
1107 },
1108#endif
1da177e4 1109#endif
d6e71144
AC		 1110 {
1111 .ctl_name = KERN_SETUID_DUMPABLE,
1112 .procname = "suid_dumpable",
1113 .data = &suid_dumpable,
1114 .maxlen = sizeof(int),
1115 .mode = 0644,
1116 .proc_handler = &proc_dointvec,
1117 },
2abc26fc
EB		 1118#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1119 {
1120 .ctl_name = CTL_UNNUMBERED,
1121 .procname = "binfmt_misc",
1122 .mode = 0555,
1123 .child = binfmt_misc_table,
1124 },
1125#endif
1da177e4
LT		 1126 { .ctl_name = 0 }
1127};
1128
1129static ctl_table debug_table[] = {
1130 { .ctl_name = 0 }
1131};
1132
1133static ctl_table dev_table[] = {
1134 { .ctl_name = 0 }
0eeca283 1135};
1da177e4 1136
330d57fb
AV		 1137static DEFINE_SPINLOCK(sysctl_lock);
1138
1139/* called under sysctl_lock */
1140static int use_table(struct ctl_table_header *p)
1141{
1142 if (unlikely(p->unregistering))
1143 return 0;
1144 p->used++;
1145 return 1;
1146}
1147
1148/* called under sysctl_lock */
1149static void unuse_table(struct ctl_table_header *p)
1150{
1151 if (!--p->used)
1152 if (unlikely(p->unregistering))
1153 complete(p->unregistering);
1154}
1155
1156/* called under sysctl_lock, will reacquire if has to wait */
1157static void start_unregistering(struct ctl_table_header *p)
1158{
1159 /*
1160 * if p->used is 0, nobody will ever touch that entry again;
1161 * we'll eliminate all paths to it before dropping sysctl_lock
1162 */
1163 if (unlikely(p->used)) {
1164 struct completion wait;
1165 init_completion(&wait);
1166 p->unregistering = &wait;
1167 spin_unlock(&sysctl_lock);
1168 wait_for_completion(&wait);
1169 spin_lock(&sysctl_lock);
1170 }
1171 /*
1172 * do not remove from the list until nobody holds it; walking the
1173 * list in do_sysctl() relies on that.
1174 */
1175 list_del_init(&p->ctl_entry);
1176}
1177
805b5d5e
EB		 1178void sysctl_head_finish(struct ctl_table_header *head)
1179{
1180 if (!head)
1181 return;
1182 spin_lock(&sysctl_lock);
1183 unuse_table(head);
1184 spin_unlock(&sysctl_lock);
1185}
1186
1187struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1188{
1189 struct ctl_table_header *head;
1190 struct list_head *tmp;
1191 spin_lock(&sysctl_lock);
1192 if (prev) {
1193 tmp = &prev->ctl_entry;
1194 unuse_table(prev);
1195 goto next;
1196 }
1197 tmp = &root_table_header.ctl_entry;
1198 for (;;) {
1199 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1200
1201 if (!use_table(head))
1202 goto next;
1203 spin_unlock(&sysctl_lock);
1204 return head;
1205 next:
1206 tmp = tmp->next;
1207 if (tmp == &root_table_header.ctl_entry)
1208 break;
1209 }
1210 spin_unlock(&sysctl_lock);
1211 return NULL;
1212}
1213
b89a8171 1214#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1215int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1216 void __user *newval, size_t newlen)
1217{
805b5d5e 1218 struct ctl_table_header *head;
330d57fb 1219 int error = -ENOTDIR;
1da177e4
LT		 1220
1221 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1222 return -ENOTDIR;
1223 if (oldval) {
1224 int old_len;
1225 if (!oldlenp || get_user(old_len, oldlenp))
1226 return -EFAULT;
1227 }
330d57fb 1228
805b5d5e
EB		 1229 for (head = sysctl_head_next(NULL); head;
1230 head = sysctl_head_next(head)) {
330d57fb 1231 error = parse_table(name, nlen, oldval, oldlenp,
1f29bcd7 1232 newval, newlen, head->ctl_table);
805b5d5e
EB		 1233 if (error != -ENOTDIR) {
1234 sysctl_head_finish(head);
330d57fb 1235 break;
805b5d5e
EB		 1236 }
1237 }
330d57fb 1238 return error;
1da177e4
LT		 1239}
1240
1241asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1242{
1243 struct __sysctl_args tmp;
1244 int error;
1245
1246 if (copy_from_user(&tmp, args, sizeof(tmp)))
1247 return -EFAULT;
1248
1249 lock_kernel();
1250 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1251 tmp.newval, tmp.newlen);
1252 unlock_kernel();
1253 return error;
1254}
b89a8171 1255#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1256
1257/*
1ff007eb 1258 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1259 * some sysctl variables are readonly even to root.
1260 */
1261
1262static int test_perm(int mode, int op)
1263{
1264 if (!current->euid)
1265 mode >>= 6;
1266 else if (in_egroup_p(0))
1267 mode >>= 3;
1268 if ((mode & op & 0007) == op)
1269 return 0;
1270 return -EACCES;
1271}
1272
1ff007eb 1273int sysctl_perm(ctl_table *table, int op)
1da177e4
LT		 1274{
1275 int error;
1276 error = security_sysctl(table, op);
1277 if (error)
1278 return error;
1279 return test_perm(table->mode, op);
1280}
1281
b89a8171 1282#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1283static int parse_table(int __user *name, int nlen,
1284 void __user *oldval, size_t __user *oldlenp,
1285 void __user *newval, size_t newlen,
1f29bcd7 1286 ctl_table *table)
1da177e4
LT		 1287{
1288 int n;
1289repeat:
1290 if (!nlen)
1291 return -ENOTDIR;
1292 if (get_user(n, name))
1293 return -EFAULT;
d99f160a
EB		 1294 for ( ; table->ctl_name || table->procname; table++) {
1295 if (!table->ctl_name)
1296 continue;
6703ddfc 1297 if (n == table->ctl_name) {
1da177e4
LT		 1298 int error;
1299 if (table->child) {
1ff007eb 1300 if (sysctl_perm(table, 001))
1da177e4 1301 return -EPERM;
1da177e4
LT		 1302 name++;
1303 nlen--;
1304 table = table->child;
1305 goto repeat;
1306 }
1307 error = do_sysctl_strategy(table, name, nlen,
1308 oldval, oldlenp,
1f29bcd7 1309 newval, newlen);
1da177e4
LT		 1310 return error;
1311 }
1312 }
1313 return -ENOTDIR;
1314}
1315
1316/* Perform the actual read/write of a sysctl table entry. */
1317int do_sysctl_strategy (ctl_table *table,
1318 int __user *name, int nlen,
1319 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 1320 void __user *newval, size_t newlen)
1da177e4
LT		 1321{
1322 int op = 0, rc;
1323 size_t len;
1324
1325 if (oldval)
1326 op |= 004;
1327 if (newval)
1328 op |= 002;
1ff007eb 1329 if (sysctl_perm(table, op))
1da177e4
LT		 1330 return -EPERM;
1331
1332 if (table->strategy) {
1333 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1f29bcd7 1334 newval, newlen);
1da177e4
LT		 1335 if (rc < 0)
1336 return rc;
1337 if (rc > 0)
1338 return 0;
1339 }
1340
1341 /* If there is no strategy routine, or if the strategy returns
1342 * zero, proceed with automatic r/w */
1343 if (table->data && table->maxlen) {
1344 if (oldval && oldlenp) {
1345 if (get_user(len, oldlenp))
1346 return -EFAULT;
1347 if (len) {
1348 if (len > table->maxlen)
1349 len = table->maxlen;
1350 if(copy_to_user(oldval, table->data, len))
1351 return -EFAULT;
1352 if(put_user(len, oldlenp))
1353 return -EFAULT;
1354 }
1355 }
1356 if (newval && newlen) {
1357 len = newlen;
1358 if (len > table->maxlen)
1359 len = table->maxlen;
1360 if(copy_from_user(table->data, newval, len))
1361 return -EFAULT;
1362 }
1363 }
1364 return 0;
1365}
b89a8171 1366#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 1367
d912b0cc
EB		 1368static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1369{
1370 for (; table->ctl_name || table->procname; table++) {
1371 table->parent = parent;
1372 if (table->child)
1373 sysctl_set_parent(table, table->child);
1374 }
1375}
1376
1377static __init int sysctl_init(void)
1378{
1379 sysctl_set_parent(NULL, root_table);
1380 return 0;
1381}
1382
1383core_initcall(sysctl_init);
1384
1da177e4
LT		 1385/**
1386 * register_sysctl_table - register a sysctl hierarchy
1387 * @table: the top-level table structure
1da177e4
LT		 1388 *
1389 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1390 * array. An entry with a ctl_name of 0 terminates the table.
1391 *
1392 * The members of the &ctl_table structure are used as follows:
1393 *
1394 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1395 * must be unique within that level of sysctl
1396 *
1397 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1398 * enter a sysctl file
1399 *
1400 * data - a pointer to data for use by proc_handler
1401 *
1402 * maxlen - the maximum size in bytes of the data
1403 *
1404 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1405 *
1406 * child - a pointer to the child sysctl table if this entry is a directory, or
1407 * %NULL.
1408 *
1409 * proc_handler - the text handler routine (described below)
1410 *
1411 * strategy - the strategy routine (described below)
1412 *
1413 * de - for internal use by the sysctl routines
1414 *
1415 * extra1, extra2 - extra pointers usable by the proc handler routines
1416 *
1417 * Leaf nodes in the sysctl tree will be represented by a single file
1418 * under /proc; non-leaf nodes will be represented by directories.
1419 *
1420 * sysctl(2) can automatically manage read and write requests through
1421 * the sysctl table. The data and maxlen fields of the ctl_table
1422 * struct enable minimal validation of the values being written to be
1423 * performed, and the mode field allows minimal authentication.
1424 *
1425 * More sophisticated management can be enabled by the provision of a
1426 * strategy routine with the table entry. This will be called before
1427 * any automatic read or write of the data is performed.
1428 *
1429 * The strategy routine may return
1430 *
1431 * < 0 - Error occurred (error is passed to user process)
1432 *
1433 * 0 - OK - proceed with automatic read or write.
1434 *
1435 * > 0 - OK - read or write has been done by the strategy routine, so
1436 * return immediately.
1437 *
1438 * There must be a proc_handler routine for any terminal nodes
1439 * mirrored under /proc/sys (non-terminals are handled by a built-in
1440 * directory handler). Several default handlers are available to
1441 * cover common cases -
1442 *
1443 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1444 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1445 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1446 *
1447 * It is the handler's job to read the input buffer from user memory
1448 * and process it. The handler should return 0 on success.
1449 *
1450 * This routine returns %NULL on a failure to register, and a pointer
1451 * to the table header on success.
1452 */
0b4d4147 1453struct ctl_table_header *register_sysctl_table(ctl_table * table)
1da177e4
LT		 1454{
1455 struct ctl_table_header *tmp;
1456 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1457 if (!tmp)
1458 return NULL;
1459 tmp->ctl_table = table;
1460 INIT_LIST_HEAD(&tmp->ctl_entry);
330d57fb
AV		 1461 tmp->used = 0;
1462 tmp->unregistering = NULL;
d912b0cc 1463 sysctl_set_parent(NULL, table);
330d57fb 1464 spin_lock(&sysctl_lock);
0b4d4147 1465 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
330d57fb 1466 spin_unlock(&sysctl_lock);
1da177e4
LT		 1467 return tmp;
1468}
1469
1470/**
1471 * unregister_sysctl_table - unregister a sysctl table hierarchy
1472 * @header: the header returned from register_sysctl_table
1473 *
1474 * Unregisters the sysctl table and all children. proc entries may not
1475 * actually be removed until they are no longer used by anyone.
1476 */
1477void unregister_sysctl_table(struct ctl_table_header * header)
1478{
330d57fb
AV		 1479 might_sleep();
1480 spin_lock(&sysctl_lock);
1481 start_unregistering(header);
330d57fb 1482 spin_unlock(&sysctl_lock);
1da177e4
LT		 1483 kfree(header);
1484}
1485
b89a8171 1486#else /* !CONFIG_SYSCTL */
93a6fefe 1487struct ctl_table_header *register_sysctl_table(ctl_table * table)
b89a8171
EB		 1488{
1489 return NULL;
1490}
1491
1492void unregister_sysctl_table(struct ctl_table_header * table)
1493{
1494}
1495
1496#endif /* CONFIG_SYSCTL */
1497
1da177e4
LT		 1498/*
1499 * /proc/sys support
1500 */
1501
b89a8171 1502#ifdef CONFIG_PROC_SYSCTL
1da177e4 1503
b1ba4ddd
AB		 1504static int _proc_do_string(void* data, int maxlen, int write,
1505 struct file *filp, void __user *buffer,
1506 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1507{
1508 size_t len;
1509 char __user *p;
1510 char c;
8d060877
ON		 1511
1512 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1513 *lenp = 0;
1514 return 0;
1515 }
8d060877 1516
1da177e4
LT		 1517 if (write) {
1518 len = 0;
1519 p = buffer;
1520 while (len < *lenp) {
1521 if (get_user(c, p++))
1522 return -EFAULT;
1523 if (c == 0 || c == '\n')
1524 break;
1525 len++;
1526 }
f5dd3d6f
SV		 1527 if (len >= maxlen)
1528 len = maxlen-1;
1529 if(copy_from_user(data, buffer, len))
1da177e4 1530 return -EFAULT;
f5dd3d6f 1531 ((char *) data)[len] = 0;
1da177e4
LT		 1532 *ppos += *lenp;
1533 } else {
f5dd3d6f
SV		 1534 len = strlen(data);
1535 if (len > maxlen)
1536 len = maxlen;
8d060877
ON		 1537
1538 if (*ppos > len) {
1539 *lenp = 0;
1540 return 0;
1541 }
1542
1543 data += *ppos;
1544 len -= *ppos;
1545
1da177e4
LT		 1546 if (len > *lenp)
1547 len = *lenp;
1548 if (len)
f5dd3d6f 1549 if(copy_to_user(buffer, data, len))
1da177e4
LT		 1550 return -EFAULT;
1551 if (len < *lenp) {
1552 if(put_user('\n', ((char __user *) buffer) + len))
1553 return -EFAULT;
1554 len++;
1555 }
1556 *lenp = len;
1557 *ppos += len;
1558 }
1559 return 0;
1560}
1561
f5dd3d6f
SV		 1562/**
1563 * proc_dostring - read a string sysctl
1564 * @table: the sysctl table
1565 * @write: %TRUE if this is a write to the sysctl file
1566 * @filp: the file structure
1567 * @buffer: the user buffer
1568 * @lenp: the size of the user buffer
1569 * @ppos: file position
1570 *
1571 * Reads/writes a string from/to the user buffer. If the kernel
1572 * buffer provided is not large enough to hold the string, the
1573 * string is truncated. The copied string is %NULL-terminated.
1574 * If the string is being read by the user process, it is copied
1575 * and a newline '\n' is added. It is truncated if the buffer is
1576 * not large enough.
1577 *
1578 * Returns 0 on success.
1579 */
1580int proc_dostring(ctl_table *table, int write, struct file *filp,
1581 void __user *buffer, size_t *lenp, loff_t *ppos)
1582{
1583 return _proc_do_string(table->data, table->maxlen, write, filp,
1584 buffer, lenp, ppos);
1585}
1586
1da177e4
LT		 1587
1588static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1589 int *valp,
1590 int write, void *data)
1591{
1592 if (write) {
1593 *valp = *negp ? -*lvalp : *lvalp;
1594 } else {
1595 int val = *valp;
1596 if (val < 0) {
1597 *negp = -1;
1598 *lvalp = (unsigned long)-val;
1599 } else {
1600 *negp = 0;
1601 *lvalp = (unsigned long)val;
1602 }
1603 }
1604 return 0;
1605}
1606
fcfbd547
KK		 1607static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1608 int write, struct file *filp, void __user *buffer,
1609 size_t *lenp, loff_t *ppos,
1da177e4
LT		 1610 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1611 int write, void *data),
1612 void *data)
1613{
1614#define TMPBUFLEN 21
1615 int *i, vleft, first=1, neg, val;
1616 unsigned long lval;
1617 size_t left, len;
1618
1619 char buf[TMPBUFLEN], *p;
1620 char __user *s = buffer;
1621
fcfbd547 1622 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 1623 (*ppos && !write)) {
1624 *lenp = 0;
1625 return 0;
1626 }
1627
fcfbd547 1628 i = (int *) tbl_data;
1da177e4
LT		 1629 vleft = table->maxlen / sizeof(*i);
1630 left = *lenp;
1631
1632 if (!conv)
1633 conv = do_proc_dointvec_conv;
1634
1635 for (; left && vleft--; i++, first=0) {
1636 if (write) {
1637 while (left) {
1638 char c;
1639 if (get_user(c, s))
1640 return -EFAULT;
1641 if (!isspace(c))
1642 break;
1643 left--;
1644 s++;
1645 }
1646 if (!left)
1647 break;
1648 neg = 0;
1649 len = left;
1650 if (len > sizeof(buf) - 1)
1651 len = sizeof(buf) - 1;
1652 if (copy_from_user(buf, s, len))
1653 return -EFAULT;
1654 buf[len] = 0;
1655 p = buf;
1656 if (*p == '-' && left > 1) {
1657 neg = 1;
bd9b0bac 1658 p++;
1da177e4
LT		 1659 }
1660 if (*p < '0' || *p > '9')
1661 break;
1662
1663 lval = simple_strtoul(p, &p, 0);
1664
1665 len = p-buf;
1666 if ((len < left) && *p && !isspace(*p))
1667 break;
1668 if (neg)
1669 val = -val;
1670 s += len;
1671 left -= len;
1672
1673 if (conv(&neg, &lval, i, 1, data))
1674 break;
1675 } else {
1676 p = buf;
1677 if (!first)
1678 *p++ = '\t';
1679
1680 if (conv(&neg, &lval, i, 0, data))
1681 break;
1682
1683 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1684 len = strlen(buf);
1685 if (len > left)
1686 len = left;
1687 if(copy_to_user(s, buf, len))
1688 return -EFAULT;
1689 left -= len;
1690 s += len;
1691 }
1692 }
1693
1694 if (!write && !first && left) {
1695 if(put_user('\n', s))
1696 return -EFAULT;
1697 left--, s++;
1698 }
1699 if (write) {
1700 while (left) {
1701 char c;
1702 if (get_user(c, s++))
1703 return -EFAULT;
1704 if (!isspace(c))
1705 break;
1706 left--;
1707 }
1708 }
1709 if (write && first)
1710 return -EINVAL;
1711 *lenp -= left;
1712 *ppos += *lenp;
1713 return 0;
1714#undef TMPBUFLEN
1715}
1716
fcfbd547
KK		 1717static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1718 void __user *buffer, size_t *lenp, loff_t *ppos,
1719 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1720 int write, void *data),
1721 void *data)
1722{
1723 return __do_proc_dointvec(table->data, table, write, filp,
1724 buffer, lenp, ppos, conv, data);
1725}
1726
1da177e4
LT		 1727/**
1728 * proc_dointvec - read a vector of integers
1729 * @table: the sysctl table
1730 * @write: %TRUE if this is a write to the sysctl file
1731 * @filp: the file structure
1732 * @buffer: the user buffer
1733 * @lenp: the size of the user buffer
1734 * @ppos: file position
1735 *
1736 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1737 * values from/to the user buffer, treated as an ASCII string.
1738 *
1739 * Returns 0 on success.
1740 */
1741int proc_dointvec(ctl_table *table, int write, struct file *filp,
1742 void __user *buffer, size_t *lenp, loff_t *ppos)
1743{
1744 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1745 NULL,NULL);
1746}
1747
1748#define OP_SET 0
1749#define OP_AND 1
34f5a398 1750#define OP_OR 2
1da177e4
LT		 1751
1752static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1753 int *valp,
1754 int write, void *data)
1755{
1756 int op = *(int *)data;
1757 if (write) {
1758 int val = *negp ? -*lvalp : *lvalp;
1759 switch(op) {
1760 case OP_SET: *valp = val; break;
1761 case OP_AND: *valp &= val; break;
34f5a398 1762 case OP_OR: *valp |= val; break;
1da177e4
LT		 1763 }
1764 } else {
1765 int val = *valp;
1766 if (val < 0) {
1767 *negp = -1;
1768 *lvalp = (unsigned long)-val;
1769 } else {
1770 *negp = 0;
1771 *lvalp = (unsigned long)val;
1772 }
1773 }
1774 return 0;
1775}
1776
1777/*
1778 * init may raise the set.
1779 */
1780
1781int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1782 void __user *buffer, size_t *lenp, loff_t *ppos)
1783{
1784 int op;
1785
6ff1b442 1786 if (write && !capable(CAP_SYS_MODULE)) {
1da177e4
LT		 1787 return -EPERM;
1788 }
1789
f400e198 1790 op = is_init(current) ? OP_SET : OP_AND;
1da177e4
LT		 1791 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1792 do_proc_dointvec_bset_conv,&op);
1793}
1794
34f5a398
TT		 1795/*
1796 * Taint values can only be increased
1797 */
1798static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
1799 void __user *buffer, size_t *lenp, loff_t *ppos)
1800{
1801 int op;
1802
91fcd412 1803 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 1804 return -EPERM;
1805
1806 op = OP_OR;
1807 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1808 do_proc_dointvec_bset_conv,&op);
1809}
1810
1da177e4
LT		 1811struct do_proc_dointvec_minmax_conv_param {
1812 int *min;
1813 int *max;
1814};
1815
1816static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1817 int *valp,
1818 int write, void *data)
1819{
1820 struct do_proc_dointvec_minmax_conv_param *param = data;
1821 if (write) {
1822 int val = *negp ? -*lvalp : *lvalp;
1823 if ((param->min && *param->min > val) ||
1824 (param->max && *param->max < val))
1825 return -EINVAL;
1826 *valp = val;
1827 } else {
1828 int val = *valp;
1829 if (val < 0) {
1830 *negp = -1;
1831 *lvalp = (unsigned long)-val;
1832 } else {
1833 *negp = 0;
1834 *lvalp = (unsigned long)val;
1835 }
1836 }
1837 return 0;
1838}
1839
1840/**
1841 * proc_dointvec_minmax - read a vector of integers with min/max values
1842 * @table: the sysctl table
1843 * @write: %TRUE if this is a write to the sysctl file
1844 * @filp: the file structure
1845 * @buffer: the user buffer
1846 * @lenp: the size of the user buffer
1847 * @ppos: file position
1848 *
1849 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1850 * values from/to the user buffer, treated as an ASCII string.
1851 *
1852 * This routine will ensure the values are within the range specified by
1853 * table->extra1 (min) and table->extra2 (max).
1854 *
1855 * Returns 0 on success.
1856 */
1857int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1858 void __user *buffer, size_t *lenp, loff_t *ppos)
1859{
1860 struct do_proc_dointvec_minmax_conv_param param = {
1861 .min = (int *) table->extra1,
1862 .max = (int *) table->extra2,
1863 };
1864 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1865 do_proc_dointvec_minmax_conv, &param);
1866}
1867
fcfbd547 1868static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
1da177e4
LT		 1869 struct file *filp,
1870 void __user *buffer,
1871 size_t *lenp, loff_t *ppos,
1872 unsigned long convmul,
1873 unsigned long convdiv)
1874{
1875#define TMPBUFLEN 21
1876 unsigned long *i, *min, *max, val;
1877 int vleft, first=1, neg;
1878 size_t len, left;
1879 char buf[TMPBUFLEN], *p;
1880 char __user *s = buffer;
1881
fcfbd547 1882 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 1883 (*ppos && !write)) {
1884 *lenp = 0;
1885 return 0;
1886 }
1887
fcfbd547 1888 i = (unsigned long *) data;
1da177e4
LT		 1889 min = (unsigned long *) table->extra1;
1890 max = (unsigned long *) table->extra2;
1891 vleft = table->maxlen / sizeof(unsigned long);
1892 left = *lenp;
1893
1894 for (; left && vleft--; i++, min++, max++, first=0) {
1895 if (write) {
1896 while (left) {
1897 char c;
1898 if (get_user(c, s))
1899 return -EFAULT;
1900 if (!isspace(c))
1901 break;
1902 left--;
1903 s++;
1904 }
1905 if (!left)
1906 break;
1907 neg = 0;
1908 len = left;
1909 if (len > TMPBUFLEN-1)
1910 len = TMPBUFLEN-1;
1911 if (copy_from_user(buf, s, len))
1912 return -EFAULT;
1913 buf[len] = 0;
1914 p = buf;
1915 if (*p == '-' && left > 1) {
1916 neg = 1;
bd9b0bac 1917 p++;
1da177e4
LT		 1918 }
1919 if (*p < '0' || *p > '9')
1920 break;
1921 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1922 len = p-buf;
1923 if ((len < left) && *p && !isspace(*p))
1924 break;
1925 if (neg)
1926 val = -val;
1927 s += len;
1928 left -= len;
1929
1930 if(neg)
1931 continue;
1932 if ((min && val < *min) || (max && val > *max))
1933 continue;
1934 *i = val;
1935 } else {
1936 p = buf;
1937 if (!first)
1938 *p++ = '\t';
1939 sprintf(p, "%lu", convdiv * (*i) / convmul);
1940 len = strlen(buf);
1941 if (len > left)
1942 len = left;
1943 if(copy_to_user(s, buf, len))
1944 return -EFAULT;
1945 left -= len;
1946 s += len;
1947 }
1948 }
1949
1950 if (!write && !first && left) {
1951 if(put_user('\n', s))
1952 return -EFAULT;
1953 left--, s++;
1954 }
1955 if (write) {
1956 while (left) {
1957 char c;
1958 if (get_user(c, s++))
1959 return -EFAULT;
1960 if (!isspace(c))
1961 break;
1962 left--;
1963 }
1964 }
1965 if (write && first)
1966 return -EINVAL;
1967 *lenp -= left;
1968 *ppos += *lenp;
1969 return 0;
1970#undef TMPBUFLEN
1971}
1972
fcfbd547
KK		 1973static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1974 struct file *filp,
1975 void __user *buffer,
1976 size_t *lenp, loff_t *ppos,
1977 unsigned long convmul,
1978 unsigned long convdiv)
1979{
1980 return __do_proc_doulongvec_minmax(table->data, table, write,
1981 filp, buffer, lenp, ppos, convmul, convdiv);
1982}
1983
1da177e4
LT		 1984/**
1985 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1986 * @table: the sysctl table
1987 * @write: %TRUE if this is a write to the sysctl file
1988 * @filp: the file structure
1989 * @buffer: the user buffer
1990 * @lenp: the size of the user buffer
1991 * @ppos: file position
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1994 * values from/to the user buffer, treated as an ASCII string.
1995 *
1996 * This routine will ensure the values are within the range specified by
1997 * table->extra1 (min) and table->extra2 (max).
1998 *
1999 * Returns 0 on success.
2000 */
2001int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003{
2004 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2005}
2006
2007/**
2008 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2009 * @table: the sysctl table
2010 * @write: %TRUE if this is a write to the sysctl file
2011 * @filp: the file structure
2012 * @buffer: the user buffer
2013 * @lenp: the size of the user buffer
2014 * @ppos: file position
2015 *
2016 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2017 * values from/to the user buffer, treated as an ASCII string. The values
2018 * are treated as milliseconds, and converted to jiffies when they are stored.
2019 *
2020 * This routine will ensure the values are within the range specified by
2021 * table->extra1 (min) and table->extra2 (max).
2022 *
2023 * Returns 0 on success.
2024 */
2025int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2026 struct file *filp,
2027 void __user *buffer,
2028 size_t *lenp, loff_t *ppos)
2029{
2030 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2031 lenp, ppos, HZ, 1000l);
2032}
2033
2034
2035static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2036 int *valp,
2037 int write, void *data)
2038{
2039 if (write) {
cba9f33d
BS		 2040 if (*lvalp > LONG_MAX / HZ)
2041 return 1;
1da177e4
LT		 2042 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2043 } else {
2044 int val = *valp;
2045 unsigned long lval;
2046 if (val < 0) {
2047 *negp = -1;
2048 lval = (unsigned long)-val;
2049 } else {
2050 *negp = 0;
2051 lval = (unsigned long)val;
2052 }
2053 *lvalp = lval / HZ;
2054 }
2055 return 0;
2056}
2057
2058static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2059 int *valp,
2060 int write, void *data)
2061{
2062 if (write) {
cba9f33d
BS		 2063 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2064 return 1;
1da177e4
LT		 2065 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2066 } else {
2067 int val = *valp;
2068 unsigned long lval;
2069 if (val < 0) {
2070 *negp = -1;
2071 lval = (unsigned long)-val;
2072 } else {
2073 *negp = 0;
2074 lval = (unsigned long)val;
2075 }
2076 *lvalp = jiffies_to_clock_t(lval);
2077 }
2078 return 0;
2079}
2080
2081static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2082 int *valp,
2083 int write, void *data)
2084{
2085 if (write) {
2086 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2087 } else {
2088 int val = *valp;
2089 unsigned long lval;
2090 if (val < 0) {
2091 *negp = -1;
2092 lval = (unsigned long)-val;
2093 } else {
2094 *negp = 0;
2095 lval = (unsigned long)val;
2096 }
2097 *lvalp = jiffies_to_msecs(lval);
2098 }
2099 return 0;
2100}
2101
2102/**
2103 * proc_dointvec_jiffies - read a vector of integers as seconds
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @filp: the file structure
2107 * @buffer: the user buffer
2108 * @lenp: the size of the user buffer
2109 * @ppos: file position
2110 *
2111 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2112 * values from/to the user buffer, treated as an ASCII string.
2113 * The values read are assumed to be in seconds, and are converted into
2114 * jiffies.
2115 *
2116 * Returns 0 on success.
2117 */
2118int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120{
2121 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2122 do_proc_dointvec_jiffies_conv,NULL);
2123}
2124
2125/**
2126 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2127 * @table: the sysctl table
2128 * @write: %TRUE if this is a write to the sysctl file
2129 * @filp: the file structure
2130 * @buffer: the user buffer
2131 * @lenp: the size of the user buffer
1e5d5331 2132 * @ppos: pointer to the file position
1da177e4
LT		 2133 *
2134 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2135 * values from/to the user buffer, treated as an ASCII string.
2136 * The values read are assumed to be in 1/USER_HZ seconds, and
2137 * are converted into jiffies.
2138 *
2139 * Returns 0 on success.
2140 */
2141int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2142 void __user *buffer, size_t *lenp, loff_t *ppos)
2143{
2144 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2145 do_proc_dointvec_userhz_jiffies_conv,NULL);
2146}
2147
2148/**
2149 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2150 * @table: the sysctl table
2151 * @write: %TRUE if this is a write to the sysctl file
2152 * @filp: the file structure
2153 * @buffer: the user buffer
2154 * @lenp: the size of the user buffer
67be2dd1
MW		 2155 * @ppos: file position
2156 * @ppos: the current position in the file
1da177e4
LT		 2157 *
2158 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2159 * values from/to the user buffer, treated as an ASCII string.
2160 * The values read are assumed to be in 1/1000 seconds, and
2161 * are converted into jiffies.
2162 *
2163 * Returns 0 on success.
2164 */
2165int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2166 void __user *buffer, size_t *lenp, loff_t *ppos)
2167{
2168 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2169 do_proc_dointvec_ms_jiffies_conv, NULL);
2170}
2171
9ec52099
CLG		 2172static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2173 void __user *buffer, size_t *lenp, loff_t *ppos)
2174{
2175 struct pid *new_pid;
2176 pid_t tmp;
2177 int r;
2178
2179 tmp = pid_nr(cad_pid);
2180
2181 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2182 lenp, ppos, NULL, NULL);
2183 if (r || !write)
2184 return r;
2185
2186 new_pid = find_get_pid(tmp);
2187 if (!new_pid)
2188 return -ESRCH;
2189
2190 put_pid(xchg(&cad_pid, new_pid));
2191 return 0;
2192}
2193
1da177e4
LT		 2194#else /* CONFIG_PROC_FS */
2195
2196int proc_dostring(ctl_table *table, int write, struct file *filp,
2197 void __user *buffer, size_t *lenp, loff_t *ppos)
2198{
2199 return -ENOSYS;
2200}
2201
1da177e4
LT		 2202int proc_dointvec(ctl_table *table, int write, struct file *filp,
2203 void __user *buffer, size_t *lenp, loff_t *ppos)
2204{
2205 return -ENOSYS;
2206}
2207
2208int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2209 void __user *buffer, size_t *lenp, loff_t *ppos)
2210{
2211 return -ENOSYS;
2212}
2213
2214int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2215 void __user *buffer, size_t *lenp, loff_t *ppos)
2216{
2217 return -ENOSYS;
2218}
2219
2220int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2221 void __user *buffer, size_t *lenp, loff_t *ppos)
2222{
2223 return -ENOSYS;
2224}
2225
2226int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2227 void __user *buffer, size_t *lenp, loff_t *ppos)
2228{
2229 return -ENOSYS;
2230}
2231
2232int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234{
2235 return -ENOSYS;
2236}
2237
2238int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2239 void __user *buffer, size_t *lenp, loff_t *ppos)
2240{
2241 return -ENOSYS;
2242}
2243
2244int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2245 struct file *filp,
2246 void __user *buffer,
2247 size_t *lenp, loff_t *ppos)
2248{
2249 return -ENOSYS;
2250}
2251
2252
2253#endif /* CONFIG_PROC_FS */
2254
2255
b89a8171 2256#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2257/*
2258 * General sysctl support routines
2259 */
2260
2261/* The generic string strategy routine: */
2262int sysctl_string(ctl_table *table, int __user *name, int nlen,
2263 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2264 void __user *newval, size_t newlen)
1da177e4 2265{
1da177e4
LT		 2266 if (!table->data || !table->maxlen)
2267 return -ENOTDIR;
2268
2269 if (oldval && oldlenp) {
de9e007d
LT		 2270 size_t bufsize;
2271 if (get_user(bufsize, oldlenp))
1da177e4 2272 return -EFAULT;
de9e007d
LT		 2273 if (bufsize) {
2274 size_t len = strlen(table->data), copied;
2275
2276 /* This shouldn't trigger for a well-formed sysctl */
2277 if (len > table->maxlen)
1da177e4 2278 len = table->maxlen;
de9e007d
LT		 2279
2280 /* Copy up to a max of bufsize-1 bytes of the string */
2281 copied = (len >= bufsize) ? bufsize - 1 : len;
2282
2283 if (copy_to_user(oldval, table->data, copied) ||
2284 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2285 return -EFAULT;
de9e007d 2286 if (put_user(len, oldlenp))
1da177e4
LT		 2287 return -EFAULT;
2288 }
2289 }
2290 if (newval && newlen) {
de9e007d 2291 size_t len = newlen;
1da177e4
LT		 2292 if (len > table->maxlen)
2293 len = table->maxlen;
2294 if(copy_from_user(table->data, newval, len))
2295 return -EFAULT;
2296 if (len == table->maxlen)
2297 len--;
2298 ((char *) table->data)[len] = 0;
2299 }
82c9df82 2300 return 1;
1da177e4
LT		 2301}
2302
2303/*
2304 * This function makes sure that all of the integers in the vector
2305 * are between the minimum and maximum values given in the arrays
2306 * table->extra1 and table->extra2, respectively.
2307 */
2308int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2309 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2310 void __user *newval, size_t newlen)
1da177e4
LT		 2311{
2312
2313 if (newval && newlen) {
2314 int __user *vec = (int __user *) newval;
2315 int *min = (int *) table->extra1;
2316 int *max = (int *) table->extra2;
2317 size_t length;
2318 int i;
2319
2320 if (newlen % sizeof(int) != 0)
2321 return -EINVAL;
2322
2323 if (!table->extra1 && !table->extra2)
2324 return 0;
2325
2326 if (newlen > table->maxlen)
2327 newlen = table->maxlen;
2328 length = newlen / sizeof(int);
2329
2330 for (i = 0; i < length; i++) {
2331 int value;
2332 if (get_user(value, vec + i))
2333 return -EFAULT;
2334 if (min && value < min[i])
2335 return -EINVAL;
2336 if (max && value > max[i])
2337 return -EINVAL;
2338 }
2339 }
2340 return 0;
2341}
2342
2343/* Strategy function to convert jiffies to seconds */
2344int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2345 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2346 void __user *newval, size_t newlen)
1da177e4 2347{
3ee75ac3 2348 if (oldval && oldlenp) {
1da177e4 2349 size_t olen;
3ee75ac3
AD		 2350
2351 if (get_user(olen, oldlenp))
2352 return -EFAULT;
2353 if (olen) {
2354 int val;
2355
2356 if (olen < sizeof(int))
2357 return -EINVAL;
2358
2359 val = *(int *)(table->data) / HZ;
2360 if (put_user(val, (int __user *)oldval))
2361 return -EFAULT;
2362 if (put_user(sizeof(int), oldlenp))
1da177e4 2363 return -EFAULT;
1da177e4 2364 }
1da177e4
LT		 2365 }
2366 if (newval && newlen) {
2367 int new;
2368 if (newlen != sizeof(int))
2369 return -EINVAL;
2370 if (get_user(new, (int __user *)newval))
2371 return -EFAULT;
2372 *(int *)(table->data) = new*HZ;
2373 }
2374 return 1;
2375}
2376
2377/* Strategy function to convert jiffies to seconds */
2378int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2379 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2380 void __user *newval, size_t newlen)
1da177e4 2381{
3ee75ac3 2382 if (oldval && oldlenp) {
1da177e4 2383 size_t olen;
3ee75ac3
AD		 2384
2385 if (get_user(olen, oldlenp))
2386 return -EFAULT;
2387 if (olen) {
2388 int val;
2389
2390 if (olen < sizeof(int))
2391 return -EINVAL;
2392
2393 val = jiffies_to_msecs(*(int *)(table->data));
2394 if (put_user(val, (int __user *)oldval))
2395 return -EFAULT;
2396 if (put_user(sizeof(int), oldlenp))
1da177e4 2397 return -EFAULT;
1da177e4 2398 }
1da177e4
LT		 2399 }
2400 if (newval && newlen) {
2401 int new;
2402 if (newlen != sizeof(int))
2403 return -EINVAL;
2404 if (get_user(new, (int __user *)newval))
2405 return -EFAULT;
2406 *(int *)(table->data) = msecs_to_jiffies(new);
2407 }
2408 return 1;
2409}
2410
c4b8b769 2411
c4b8b769 2412
b89a8171 2413#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2414
2415
2416asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2417{
b89a8171 2418 static int msg_count;
0e009be8
EB		 2419 struct __sysctl_args tmp;
2420 int name[CTL_MAXNAME];
2421 int i;
2422
2423 /* Read in the sysctl name for better debug message logging */
2424 if (copy_from_user(&tmp, args, sizeof(tmp)))
2425 return -EFAULT;
2426 if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2427 return -ENOTDIR;
2428 for (i = 0; i < tmp.nlen; i++)
2429 if (get_user(name[i], tmp.name + i))
2430 return -EFAULT;
2431
2432 /* Ignore accesses to kernel.version */
2433 if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2434 goto out;
b89a8171
EB		 2435
2436 if (msg_count < 5) {
2437 msg_count++;
2438 printk(KERN_INFO
2439 "warning: process `%s' used the removed sysctl "
0e009be8
EB		 2440 "system call with ", current->comm);
2441 for (i = 0; i < tmp.nlen; i++)
2442 printk("%d.", name[i]);
2443 printk("\n");
b89a8171 2444 }
0e009be8 2445out:
1da177e4
LT		 2446 return -ENOSYS;
2447}
2448
2449int sysctl_string(ctl_table *table, int __user *name, int nlen,
2450 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2451 void __user *newval, size_t newlen)
1da177e4
LT		 2452{
2453 return -ENOSYS;
2454}
2455
2456int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2457 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2458 void __user *newval, size_t newlen)
1da177e4
LT		 2459{
2460 return -ENOSYS;
2461}
2462
2463int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2464 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2465 void __user *newval, size_t newlen)
1da177e4
LT		 2466{
2467 return -ENOSYS;
2468}
2469
2470int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2471 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2472 void __user *newval, size_t newlen)
1da177e4
LT		 2473{
2474 return -ENOSYS;
2475}
2476
b89a8171 2477#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2478
2479/*
2480 * No sense putting this after each symbol definition, twice,
2481 * exception granted :-)
2482 */
2483EXPORT_SYMBOL(proc_dointvec);
2484EXPORT_SYMBOL(proc_dointvec_jiffies);
2485EXPORT_SYMBOL(proc_dointvec_minmax);
2486EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2487EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2488EXPORT_SYMBOL(proc_dostring);
2489EXPORT_SYMBOL(proc_doulongvec_minmax);
2490EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2491EXPORT_SYMBOL(register_sysctl_table);
2492EXPORT_SYMBOL(sysctl_intvec);
2493EXPORT_SYMBOL(sysctl_jiffies);
2494EXPORT_SYMBOL(sysctl_ms_jiffies);
2495EXPORT_SYMBOL(sysctl_string);
2496EXPORT_SYMBOL(unregister_sysctl_table);
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